soundwire: cadence: add clock_stop/restart routines

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Add support for clock stop and restart, with two configuration
parameters:

1) when entering the ClockStop mode, Slave-initiated wakes can be
prevented.

2) When exiting the ClockStop mode, the caller can request a Bus Reset
(either if all Slaves were configured in ClockStopMode1 or the Master
IP lost context and enumeration is required)

The code handles the case where no Slaves are present by configuring
the IP to treat COMMAND_IGNORED as success.

The exit_reset part can be dealt with in the caller, along with the
required syncArm/syncGo sequence in multi-link mode.

Signed-off-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200317163329.25501-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Rander Wang 2020-03-17 11:33:17 -05:00 • committed by Vinod Koul

parent 9bc87cce94

commit 1032504f22

2 changed files with 159 additions and 0 deletions

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157

drivers/soundwire/cadence_master.c

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2

drivers/soundwire/cadence_master.h

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